How do transformations affect the logarithmic graph?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?